From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: Juergen Gross <jgross@suse.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: [PATCH v3 02/21] xen/grant-table: never put a reserved grant on the free list
Date: Thu, 5 May 2022 10:16:21 +0200 [thread overview]
Message-ID: <20220505081640.17425-3-jgross@suse.com> (raw)
In-Reply-To: <20220505081640.17425-1-jgross@suse.com>
Make sure a reserved grant is never put on the free list, as this could
cause hard to debug errors.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
V3:
- new patch
---
drivers/xen/grant-table.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 6ea31ea26008..1a1aec0a88a1 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -207,6 +207,10 @@ static inline void check_free_callbacks(void)
static void put_free_entry(grant_ref_t ref)
{
unsigned long flags;
+
+ if (unlikely(ref < GNTTAB_NR_RESERVED_ENTRIES))
+ return;
+
spin_lock_irqsave(&gnttab_list_lock, flags);
gnttab_entry(ref) = gnttab_free_head;
gnttab_free_head = ref;
--
2.35.3
next prev parent reply other threads:[~2022-05-05 8:17 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-05 8:16 [PATCH v3 00/21] xen: simplify frontend side ring setup Juergen Gross
2022-05-05 8:16 ` [PATCH v3 01/21] xen: update grant_table.h Juergen Gross
2022-05-05 8:16 ` Juergen Gross [this message]
2022-05-05 8:16 ` [PATCH v3 03/21] xen/blkfront: switch blkfront to use INVALID_GRANT_REF Juergen Gross
2022-05-09 8:20 ` Roger Pau Monné
2022-05-05 8:16 ` [PATCH v3 04/21] xen/netfront: switch netfront " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 05/21] xen/scsifront: remove unused GRANT_INVALID_REF definition Juergen Gross
2022-05-05 8:16 ` [PATCH v3 06/21] xen/usb: switch xen-hcd to use INVALID_GRANT_REF Juergen Gross
2022-05-05 8:16 ` [PATCH v3 07/21] xen/drm: switch xen_drm_front " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 08/21] xen/sound: switch xen_snd_front " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 09/21] xen/dmabuf: switch gntdev-dmabuf " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 10/21] xen/shbuf: switch xen-front-pgdir-shbuf " Juergen Gross
2022-05-09 8:47 ` Oleksandr
2022-05-05 8:16 ` [PATCH v3 11/21] xen: update ring.h Juergen Gross
2022-05-05 8:16 ` [PATCH v3 12/21] xen/xenbus: add xenbus_setup_ring() service function Juergen Gross
2022-05-05 8:16 ` [PATCH v3 13/21] xen/blkfront: use xenbus_setup_ring() and xenbus_teardown_ring() Juergen Gross
2022-05-09 8:42 ` Roger Pau Monné
2022-05-05 8:16 ` [PATCH v3 14/21] xen/netfront: " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 15/21] xen/tpmfront: " Juergen Gross
2022-05-06 22:32 ` Jarkko Sakkinen
2022-05-18 9:41 ` Juergen Gross
2022-05-18 14:57 ` Jarkko Sakkinen
2022-05-05 8:16 ` [PATCH v3 16/21] xen/drmfront: " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 17/21] xen/pcifront: " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 18/21] xen/scsifront: " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 19/21] xen/usbfront: " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 20/21] xen/sndfront: " Juergen Gross
2022-05-05 8:16 ` [PATCH v3 21/21] xen/xenbus: eliminate xenbus_grant_ring() Juergen Gross
2022-05-06 0:12 ` [PATCH v3 00/21] xen: simplify frontend side ring setup Boris Ostrovsky
2022-05-09 13:23 ` Oleksandr
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